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Furnace combustion flue gas online monitoring system and monitoring method

A combustion flue gas and monitoring system technology, applied to chemical instruments and methods, cleaning methods using gas flow, cleaning methods and appliances, etc., can solve the problems of low accuracy and stability, and achieve improved response time and improved smoke Effect of gas flow rate and improvement of analysis accuracy

Active Publication Date: 2020-11-10
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem that the existing flue gas monitoring system monitors flue gas components, its accuracy and stability are not high, the present invention provides a kiln combustion smoke The gas online monitoring system can discharge the redundant sampling flue gas, ensure the stable flow rate at the inlet of the gas analyzer, improve the detection accuracy of the flue gas composition, and it can make real-time predictions on the discharge of the sampling flue gas according to the flue gas inside the pipeline. Adjust to ensure that the system is in a stable voltage and current state, and the system stability is excellent

Method used

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  • Furnace combustion flue gas online monitoring system and monitoring method
  • Furnace combustion flue gas online monitoring system and monitoring method

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Embodiment 1

[0044] An online monitoring system for kiln combustion flue gas is used to collect and analyze the combustion flue gas of the kiln, and judge the air-fuel ratio of the kiln combustion according to the analyzed flue gas composition, so as to adjust the industrial production. Such as figure 1 As shown, the system mainly includes a sampling unit, a processing unit, a vacuum pump 7, an analysis unit 12, an electronic control device 17, a backflushing unit, a calibration unit, and some monitoring and control devices for flue gas flow and pressure in pipelines, which are detailed below The structure and working principle are described in detail. The analysis unit 12 is a common device on the market for detecting NOx, CO and other gases. This embodiment is a gas analyzer, and the electronic control device 17 is a PLC controller.

[0045] The sampling unit is used to take flue gas as a sample gas from a kiln such as a heating furnace, and includes a sampling probe 1 and an electric s...

Embodiment 2

[0056] A method for on-line monitoring of furnace combustion flue gas, using the on-line monitoring system of embodiment 1, comprising the following steps:

[0057] 1. Analysis unit calibration

[0058] Before the system runs, the three-way switching valve 9 is controlled to be switched to connect with the standard gas source 13, and the analysis unit 12 is calibrated, and then the three-way switching valve 9 is controlled to be switched back to be connected to the vacuum pump 7.

[0059] Then, based on the actual measurement data of the analysis unit 12 that has just been calibrated, the CO after conversion is tracked and monitored when the oxygen content is 8%. 2 The change of the value can be used to judge the accuracy of the analyzer. When the relative error with the benchmark data is more than 3%, it is reminded that there may be abnormality in the analysis result, and it is recommended that the staff check the calibration of the analysis unit 12 again.

[0060] The fol...

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Abstract

The invention discloses a furnace combustion flue gas online monitoring system and monitoring method, and belongs to the field of flue gas monitoring. The system comprises a sampling unit, a processing unit, a vacuum pump, an analysis unit, an analysis flow controller, a behind-pump positive pressure meter, a diffusion flow controller and an electronic control device. The vacuum pump is connectedwith the analysis unit. The behind-pump positive pressure meter is installed behind an air outlet of the vacuum pump, the analysis flow controller is installed on a pipeline at an air inlet of the analysis unit, and an air inlet of the diffusion flow controller is communicated with a pipeline between the vacuum pump and the analysis unit. The electronic control device is electrically connected with the vacuum pump, the analysis flow controller, the behind-pump positive pressure meter and the diffusion flow controller. According to the method, the furnace combustion flue gas online monitoring system is adopted for flue gas online detection. According to the invention, the discharge condition of the sampled flue gas can be adjusted in real time according to the flue gas condition in the pipeline, the system is ensured to be in a stable-pressure and stable-flow state, and the detection precision of the flue gas is high.

Description

technical field [0001] The invention belongs to the technical field of flue gas monitoring, and more specifically relates to an online monitoring system and method for flue gas from furnace combustion. Background technique [0002] In industrial production such as kiln combustion, the out-of-control air-fuel ratio will bring a series of problems, such as in the steel rolling heating furnace: ①If the air-fuel ratio is too large, it will not only affect the product quality, but also make the oxidation burning rate and fuel consumption unbalanced. ②If the air-fuel ratio is too small, it will increase the fuel consumption on the one hand, and on the other hand, it will increase the emission of pollutants such as CO. [0003] In actual production, the online monitoring of the flue gas composition generated by the furnace combustion can directly reflect the combustion effect of the furnace. When the residual oxygen in the flue gas is high, it means that the air-fuel ratio is too h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N1/22G01N1/24B08B5/02
CPCG01N33/0016G01N33/007G01N1/2258G01N1/2205G01N1/24B08B5/02G01N2001/2261G01N33/0072
Inventor 周劲军
Owner MAANSHAN IRON & STEEL CO LTD
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